The Republic of Singapore Navy’s Unmanned Surface Vessels Progressively Operationalised to Enhance Maritime Security

Singapore is a maritime nation that relies on the sea for survival and economic prosperity. The Republic of Singapore Navy (RSN) is responsible for ensuring the security of these vital waterways, where more than 1000 vessels traverse daily. The RSN constantly enhances its capabilities to counter the evolving maritime security threats.

Today, the RSN relies on a combination of shore sensors and ships at sea to ensure maritime security of the vital waterways, alongside our national maritime security partners. After a series of rigorous tests, the RSN’s Maritime Security Unmanned Surface Vessels (MARSEC USVs) have begun operational patrols since Jan 2025, operating alongside manned ships such as the RSN’s Littoral Mission Vessels (LMVs) to enhance the security of Singapore’s waters.

Enhance Operational Capabilities – Surveillance, Interdiction and Greater Persistence

The USVs will add another layer of surveillance and operational response to our maritime security system. They conduct patrols, and when required, will investigate and interdict suspicious vessels. Operating alongside other manned vessels, the USVs will enhance the RSN’s ability to monitor and respond to situations at sea.By providing more persistent coverage in the Singapore Strait, the USVs also allow other warships like the LMVs to be deployed for other more complex missions, and at the further ranges from Singapore. The MARSEC USVs also allow the RSN to remotely¹ and safely conduct potentially risky missions at sea

Indigenously Designed for Autonomous Operations in the Busy Singapore Strait

Designed and developed in close partnership with the Defence Science & Technology Agency (DSTA) and DSO National Laboratories, the new USV harnesses the latest technologies to enable autonomous operations in congested maritime environment. The USVs are equipped with autonomous navigation systems, which includes an indigenously developed Collision Detection and Collision Avoidance (CDCA) algorithm that enables the vessel to navigate through the busy traffic in the Singapore Strait and cope with the constantly changing environmental conditions at sea. 

The CDCA autonomous navigation system integrates the USV’s perception and navigation sensors, as well as collision detection equipment used for typical maritime navigation (such as navigation charts, Maritime Automatic Identification System and Differential Global Positioning System) with an algorithm designed for the RSN’s operations. This rules-based system automates the collision avoidance decision-making process while ensuring that the USVs exhibit avoidance behaviour that complies with the Convention on the International Regulations for Preventing Collisions at Sea. This means that the USV assesses and responds to maritime traffic situations in a predictable manner, similar to that of a manned vessel.

The USV and its CDCA algorithm was extensively tested through a comprehensive Verification and Validation (V&V) approach, which included simulated-based testing and at-sea trials. This V&V approach had also been benchmarked against industry best practices, together with our global defence partners and maritime experts. Following an extensive development and testing process, the CDCA algorithm successfully completed over 12 million km of simulated distance with zero collisions, equivalent to 26 years of real-world testing. The USVs have also clocked over 1000 hours of real-world autonomous operations, with zero need for human intervention. The RSN will continue progressive experimentation to enhance the MARSEC USVs for a wider range of maritime security operations in Singapore’s congested waters.

Resource Efficient by Design

The vessel can be operated by just a two-man crew². In addition, the user-centric design of the Unmanned Systems Mission Control allows the operators to quickly plan and execute patrol profiles, track vessels of interest, and remotely warn, query and investigate vessels at sea.

[1] The MARSEC USVs are capable of autonomous navigation while the operational systems, e.g., audio warnings, are operated remotely.

[2] The Independence-class littoral mission vessels, although designed to operate with a lean crew, requires a base crew of 23 personnel.